How to know the run time of a program..?

Hi Gurus,
How to know the exact run time of a program....?
Suppose i've a program....I've changed the code to improve the performance.
Now i want to compare run time of older and new one...How to do this...?
Pls help me ....
Thanks and Regards,
Nagarjuna

Hi,
go thru the below mentioned code............
data:   start TYPE i,
          end TYPE i,
          dif TYPE i.
GET RUN TIME FIELD start.
SELECT SINGLE bukrs belnr gjahr blart budat
FROM bkpf
INTO (cc, doc, fy, doc_ty, pst_dt)
WHERE bukrs = p_bukrs
AND belnr = p_belnr
AND gjahr = p_gjahr.
GET RUN TIME FIELD end.
dif = end - start.
WRITE: /001 'Time for select',
067 ':', dif, 'microseconds'.
Reward all helpful answers.
Thanks

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